python: Selective redirection of stdout to a file

Question

I am using python's module called dis for analysis of bytecode. By default dis will send the output to the screen. I would like to re-direct the output of dis to a file without modifying dis module. The problem is, i call dis from within a long program after some condition is true. I will give an example!

class foo(object): def method1(): print 'something' name = 6 print name class boo(object): def method1(): print 'nothing' name = 10 print name import dis # other statements if foo.method1.im_func.func_code.co_code != boo.method1.im_func.func_code.co_code: dis.dis(method1) # would like to redirect output to a file dis.dis(method2) # would like to redirect output to a file # other statements

using sys.stdout = open('file', 'w') sends everything to a file. However there are some statments which are part of the main program i would like to see printed on the screen as the program is running.

Eser Aygün · Accepted Answer · 2011-05-26 08:27:04Z

You can set and reset sys.stdout before and after calling dis routines:

sys.stdout = dis_output_file dis.dis(method1) dis.dis(method2) sys.stdout = sys.__stdout__

sys.__stdout__ always refers to the actual standard output of your application.

Of course, if you are using multiple threads, this approach would fail.

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